Cliff Keen Signature 4-Strap FOAM headgear is based on the revolutionary design of the original foam E41 that Cliff Keen patented nearly 50 years ago. The Signature`s VNF foam boasts these same qualities that made it the best-selling ear guard of all time: Lightweight, more comfortable fit and greatly reduced friction on the mat. Fully adjustable. SP94 chin strap pad included.